The devout are always urged to seek the absolute truth with their hearts and not their minds. "It is the heart which is concious of God, not the reason." Rudolph Hess, when swearing in the entire Nazi party in 1934, exhorted his hearers: "Do not seek Adolph Hitler with your brains; all of you will find him with the strength of your hearts." When a movement begins to rationalize its doctrine and make it intelligible, it is a sign that its dynamic span is over; that it is primarily interested in stability. For...the stability of a regime requires the alligiance of the intellectuals, and it is to win them rather than to foster self-sacrifice in the masses that a doctrine is made intelligible.

If a doctrine is not unintelligible, it has to be vague, and if neither unintelligible nor vague, it has to be unverifiable. One has to get to heaven or the distant future to determine the truth of an effective doctrine...."

--Eric Hoffer, "The True Believer", Section 57. See also section 92, or better yet, read the whole book.